Question

Which of these is NOT a mixture?

A) baking soda
B) salt and water
C) iron filings and sand
D) metal paper clips and plastic paper clips

Answer 1

Answer: Baking Soda

Step-by-step explanation:

Baking soda is not a mixture but a chemically bonded compound which is a result of the reaction between Sodium and the carbonate anion with the following chemical formula
`NaHC{ 0 }_( 3 )`.In a mixture there are no fixed proportions of the substances involved and the substances keep their physical properties and with most mixtures the substance can be separated from each other mechanically.However a mixture of salt and water is known as a homogeneous mixture meaning the salt can no longer be seen separate in the solution but uniformly dissolves in the water.